
Refer to the exhibit. What is the meaning of the term dynamic as displayed in the output of
the show frame-relay map command shown?
A. The mapping between DLCI 100 and the end station IP address 172.16.3.1 was learned
through Inverse ARP.
B. The DLCI 100 will be dynamically changed as required to adapt to changes in the Frame
Relay cloud.
C. The DLCI 100 was dynamically allocated by the router.
D. The Serial0/0 interface acquired the IP address of 172.16.3.1 from a DHCP server.
E. The Serial0/0 interface is passing traffic.
Answer: A
Explanation:
Inverse Address Resolution Protocol (Inverse ARP) was developed to provide a
mechanism for dynamic DLCI to Layer 3 address maps. Inverse ARP works much the
same way Address Resolution Protocol (ARP) works on a LAN. However, with ARP, the
device knows the Layer 3 IP address and needs to know the remote data link MAC
address. With Inverse ARP, the router knows the Layer 2 address which is the DLCI, but
needs to know the remote Layer 3 IP address.
When using dynamic address mapping, Inverse ARP requests a next-hop protocol address
for each active PVC. Once the requesting router receives an Inverse ARP response, it
updates its DLCI-to-Layer 3 address mapping table. Dynamic address mapping is enabled
by default for all protocols enabled on a physical interface. If the Frame Relay environment
supports LMI autosensing and Inverse ARP, dynamic address mapping takes place
automatically. Therefore, no static address mapping is required.
What can be done to secure the virtual terminal interfaces on a router? (Choose two.)
A. Physically secure the interface.
B. Enter an access list and apply it to the virtual terminal interfaces using the access-class
Question No : 4
Cisco 640-801 : Practice Test
3
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